CVE-2022-48939: bpf: Add schedule points in batch ops

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-08-22 · updated 2026-06-17
Weakness: CWE-834

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Add schedule points in batch ops syzbot reported various soft lockups caused by bpf batch operations. INFO: task kworker/1:1:27 blocked for more than 140 seconds. INFO: task hung in rcu_barrier Nothing prevents batch ops to process huge amount of data, we need to add schedule points in them. Note that maybe_wait_bpf_programs(map) calls from generic_map_delete_batch() can be factorized by moving the call after the loop. This will be done later in -next tree once we get this fix merged, unless there is strong opinion doing this optimization sooner.

Affected products

Linux kernel: from 5.6 before 5.10.103; from 5.11 before 5.15.26; from 5.16 before 5.16.12 — fixed in 5.10.103, 5.15.26, 5.16.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.103, 5.15.26, 5.16.12. Check the vendor advisory for mitigations.

References

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